Mauricio Pochettino is usually the first to arrive and the last to leave Spurs' Hotspur Way training ground each day.
One employee recently revealed that the only way to get him to leave some days is to turn the power off.
The Argentine boss works at the same rate he expects of his players, and it is an attitude that has transformed Spurs from Europa League mediocrity to Premier League title contenders.
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However, that transformation did not come without some seriously hard graft and an intense fitness regime.
Spurs right-back Kyle Walker had one word for it, as quoted in The Telegraph: "horrible."
"When you reach the first team as a professional, it’s kind of like, ‘If you want to go and do gym, do gym. If you don’t, you don’t have to’. But when he came in, gym was compulsory", he revealed.
It's no wonder Pochettino's side have been able to put in such tireless performances this season. Known for their high energy and pressing, Tottenham are where they are in the table because other teams just can't keep up with them physically.
Walker's comments on Pochettino explain a lot about why it took the Spurs manager over a season to achieve his plans, as there was an enormous amount of work to be done on the players' fitness.
Juande Ramos installed a similar approach during his time as Spurs manager between 2007 and 2008, but his failure to develop a relationship with the players meant he did not enjoy Pochettino's success.
Pochettino is vying with Leicester's Claudio Ranieri for Manager of the Year, and that has come about because of a combination of his fatherly approach and his strict work ethic.
Pochettino in demand
Not so horrible after all.
In fact, Pochettino is hugely popular, both with his players and other managers, and it is that kind of acclaim that has seen him linked with some of Europe's top jobs.
But he is building a dynasty at Spurs, and if they continue at their current rate, they are only going to get better and better.
Will Mauricio Pochettino win the league with Tottenham? Have your say in the comments